KV plugin leaves starting bracket in key

Just found a difference after upgrade logstash to v6.2.3.

sample data:



kv {
  field_split => "\{\}"

expected output:

key1 => value1
key2 => value2

But after upgrade, it outputs like:

{key1 => value1
{key2 => value2

Tested on standalone logstash v6.2.2, it works fine as expected.
kv plugin version in logstash 6.2.2 is 4.0.3
in logstash 6.2.3 it is 4.1.0

Currently I am using remove_char_key => "{" as a workaround.

Even update kv plugin version to v4.1.1 (latest) doesn't help.

Have you tried the new regex option? This was added in 4.1.0.
It should be able to get this right:

Hi @Mojster thank you for suggestion.
I've tried on logstash v6.2.3 w/ kv plugin v4.1.1 like following:

kv {
  field_split_pattern => "[\{+\}+]"

But it still cannot remove the start bracket.

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